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S. H. BARTLETT & H. E. WAITE.

RECEIVER FOR TELEPHONES.

No. 271,188. Patented Jan.,23, 1883.

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through our improved receiver.

UNITED STATES PATENT OFFICE.

SAMUEL H. BARTLETT AND HENRY E. WAITE, OF NEW YORK, N. Y.,

ASSIGNORS TO CHARLES F. LIVERMORE,

OF SAME PLACE.

RECEIVER FOR TELEPHONES.

SPECIFICATION forming part of Letters Patent No. 271,188, dated January 23, 1883,

Annlidation filed June 2, 1882. (No model.)

To all whom it may concern.-

Beit known that we, SAMUEL H. BARTLETT and HENRY E. WAITE., of New York, county of New York, and State of New York, have invented new and useful Improvements in Receivers for Telephones, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification, in which- Fignre 1 represents a longitudinal section Fig. 2 is a perspective view of the split or laminated end of the magnet.

Our invention relates mainly to a novel construction of magnet for telephones and like uses, the end of the magnet being split into thin leaves or plates, all forming parts of one and the same pole, and which are consequently made to antagonize and repel each other with a force varying with the degree of disturbance in or thestrength ofthe current passing through the surrounding helix.

It further consists in a novel arrangement of the ear-piece relatively to the split magnet, dispensing with the usual diaphragm, as hereinafter explained.

In the accompanying drawings, A represents a bar-magnet of any usual or preferred form, and which is inclosed in the ordinary hollow cylindrical handle or case, B. One end of this case is enlarged, forming a head, B, chambered in its end, to receive a coil or helix, 0, surrounding the end of the magnet projecting within said chambered nd, as shown. The end ofthe magnet surrounded by the coil 0 is laminated or split intoa number of thin plates or leaves, a a, all projecting from the body of the magnet and arranged side by side in close proximity one with another, as shown.

This form of construction enables us to dispense with the diaphragm usually employed It will be apparent that the plates or a of the split or laminated end of the magnet, being all parts of .the same pole, will be of like pov larity, and as parts of like polarity repel each other the plates at a, under the action of the current passing through the coil (3, will repel each other with a force varying with the varying strength of such current, and a disturbance among the said plates is thereby produced, corresponding to the disturbances in the current passing through the coil.

Having now described our invention, what we claim as new, and desire to secure by Letters Patent, is

l. Amagnet consisting of a solid body having its end or pole made in laminated form, substantially as described.

2. In a telephone-receiver, a magnet consisting of a solid body having its end made in laminated form, in combination with the coil surrounding said end, substantially as described.

3. The combination, in a telephone-receiver, of a magnet consisting of a solid body having its end made in laminated form, a coil surrounding said end, and a handle and ear-piece applied thereto, substantially as described.

In testimony whereof we have hereunto set our hands this 31st day of May, A. D. 1882.

SAMUEL H. BARTLETT. HENRY E. WAITE.

Witnesses:

O. H. HAN-KINSON, OSCAR VAN N AME.

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